Stent with non-linear links and method of use

ABSTRACT

The invention is directed to an expandable stent for implanting in a body lumen, such as a coronary artery, peripheral artery, or other body lumen. The invention provides for a an intravascular stent having a plurality of cylindrical rings connected by undulating links. The plurality of cylindrical rings may assume an undulating shape that is similar to the shape of the undulating links. The stent has a high degree of flexibility in the longitudinal direction, yet has adequate vessel wall coverage and radial strength sufficient to hold open an artery or other body lumen.

BACKGROUND OF THE INVENTION

This invention relates to vascular repair devices, and in particular intravascular stents, which are adapted to be implanted into a patient's body lumen, such as a blood vessel or coronary artery, to maintain the patency thereof. Stents are particularly useful in the treatment of atherosclerotic stenosis in arteries and blood vessels.

Stents are generally tubular-shaped devices which function to hold open a segment of a blood vessel or other body lumen such as a coronary artery. They also are suitable for use to support and hold back a dissected arterial lining that can occlude the fluid passageway. At present, there are numerous commercial stents being marketed throughout the world. While some of these stents are flexible and have the appropriate radial rigidity needed to hold open a vessel or artery, there typically is a tradeoff between flexibility and radial strength. What has been needed and heretofore unavailable is a stent which has a high degree of flexibility so that it can be advanced through tortuous passageways and can be readily expanded, and yet have the mechanical strength to hold open the body lumen or artery into which it is implanted and provide adequate vessel wall coverage. The present invention satisfies this need. That is, the stent of the present invention has a high degree of flexibility making it possible to advance the stent easily through tortuous arteries, yet the stent has sufficient radial rigidity so that it can hold open an artery or other blood vessel, or tack up a dissected lining and provide adequate vessel wall coverage.

SUMMARY OF THE INVENTION

The present invention is directed to an intravascular stent which is highly flexible along its longitudinal axis to facilitate delivery through tortuous body lumens, but which is stiff and stable enough radially in its expanded condition to maintain the patency of a body lumen such as an artery when the stent is implanted therein.

The stent of the present invention generally includes a plurality of cylindrical rings that are interconnected to form the stent. The stent typically is mounted on a balloon catheter if it is balloon expandable or mounted on a catheter without a balloon if it is self-expanding.

Each of the cylindrical rings making up the stent have a proximal end and a distal end and a cylindrical plane defined by a cylindrical outer wall surface that extends circumferentially between the proximal end and the distal end of the cylindrical ring. The cylindrical rings are interconnected by at least one undulating link which attaches one cylindrical ring to an adjacent cylindrical ring. The undulating links are highly flexible and allow the stent to be highly flexible along its longitudinal axis. The undulating links are positioned substantially within the cylindrical plane of the outer wall surface of the cylindrical rings. The design of the highly flexible interconnecting members and their placement nested within a W-shaped member provides for uniform scaffolding and a high degree of vessel wall coverage.

The undulating links may assume various configurations but generally have an undulating or wavy shape. The undulating links include a V-shaped configuration having a concave portion and a convex portion that projects radially inward and radially outward wherein the undulating links are substantially parallel to the stent longitudinal axis. This unique design of the present invention undulating links is useful in that it helps reduce the circumference and the crimped stent diameter to a very low profile thereby enabling the delivery of the intravascular stent through a tortuous vessel.

Not only do the undulating links that interconnect the cylindrical rings provide flexibility to the stent, but the positioning of the links also enhances the flexibility by allowing uniform flexibility when the stent is bent in any direction along its longitudinal axis. Further, the cylindrical rings are configured to provide flexibility to the stent in that portions of the rings can flex or bend and tip outwardly as the stent is delivered through a tortuous vessel.

In an alternative configuration, the cylindrical rings may assume an undulating shape in order to achieve greater flexibility, in conjunction with the undulating links, along the stent longitudinal axis. This undulating shape extends radially inward and radially outward which enables the cylindrical rings to more easily deform. In addition, the undulating pattern adds to the radiopacity of the stent as it increases the mass in all areas except where the undulations run longitudinally. Further, the undulations along the stent longitudinal axis enable the packing of balloon material during crimping thus increasing stent retention. Typical crimping procedures provide a uniform and tight collapse of the stent to ensure a low profile of the diameter of the stent for placement into a smaller diameter delivery catheter.

The cylindrical rings typically are formed of a plurality of peaks and valleys, where the valleys of one cylindrical ring are circumferentially offset from the valleys of an adjacent cylindrical ring. In this configuration, at least one undulating link attaches each cylindrical ring to an adjacent cylindrical ring so that the undulating inks are positioned substantially within one of the valleys. Additionally, the undulating link attaches the valley to an adjacent peak.

While the cylindrical rings and undulating links generally are not separate structures, they have been conveniently referred to as rings and links for ease of identification. Further, the cylindrical rings can be thought of as comprising a series of U-shaped and W-shaped structures in a repeating pattern. Again, while the cylindrical rings are not divided up or segmented into U's and W's, the pattern of cylindrical rings resemble such configuration. The U's and W's promote flexibility in the stent primarily by flexing and by tipping radially outwardly as the stent is delivered through a tortuous vessel.

The undulating links are positioned so that the undulating portion is within the curved part of the W-shaped portion which generally increases the amount of vessel wall coverage. Since the undulating portion does not substantially expand (if at all) when the stent is expanded, it will continue to provide good vessel wall coverage even as the curved part of the W-shaped portion spreads apart as the stent is expanded.

The cylindrical rings of the stent are plastically deformed when expanded when the stent is made from a metal that is balloon expandable. Typically, the balloon -expandable stent is made from a stainless steel alloy or similar material.

Similarly, the cylindrical rings of the stent expand radially outwardly when the stent is formed from a superelastic alloy, such as nickel titanium (NiTi) alloys. In the case of superelastic alloys, the stent is formed in its expanded state and then constrained by a sheath on the delivery system. When the stent is in the body, the sheath is removed allowing the stent to expand to its predetermined shape.

The number and location of undulating links that interconnect adjacent cylindrical rings can be varied as the application requires. Since the undulating links typically do not expand when the cylindrical rings of the stent expand radially outwardly, the links continue to provide flexibility and to also provide a scaffolding function to assist in holding open the artery. Importantly, the addition or removal of the undulating links has very little impact on the overall longitudinal flexibility of the stent. Each undulating link is configured so that it promotes flexibility whereas prior art links actually reduce flexibility of the stent.

Because of the undulating configuration of the links, the stent has a high degree of flexibility along the stent longitudinal axis, which reduces the tendency of stent fishscaling. Stent fishscaling can occur when the stent is bent and portions of the stent project outward when the stent is in the unexpanded condition. The undulating links of the present invention reduce the likelihood of fishscaling.

Further, because of the positioning of the links, and the fact that the links do not expand or stretch when the stent is radially expanded, the overall length of the stent is substantially the same in the unexpanded and expanded configurations. In other words, the stent will not substantially shorten upon expansion.

The stent may be formed from a tube by laser cutting the pattern of cylindrical rings and undulating links in the tube. The stent also may be formed by laser cutting a flat metal sheet in the pattern of the cylindrical rings and links, and then rolling the pattern into the shape of the tubular stent and providing a longitudinal weld to form the stent.

These and other features and advantages of the invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the features of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an elevational view, partially in section, of a stent embodying features of the invention and which is mounted on a rapid-exchange delivery catheter and positioned within an artery.

FIG. 2 is an elevational view, partially in section, similar to that shown in FIG. 1 wherein the stent is expanded within the artery, so that the stent embeds within the arterial wall.

FIG. 3 is an elevational view, partially in section, showing the expanded stent implanted within the artery after withdrawal of the rapid-exchange delivery catheter.

FIG. 4 is a plan view of a flattened stent of the invention which illustrates the pattern of the stent shown in FIGS. 1-3.

FIG. 5A is an enlarged view of a portion of the stent shown in FIG. 4 depicting an undulating link connecting portions of adjacent cylindrical rings.

FIG. 5B is an enlarged side view of a portion of the stent shown in FIG. 4 depicting an undulating link connecting portions of adjacent cylindrical rings.

FIG. 6 is an enlarged sectional view of FIG. 4 depicting a U-shaped portion of the cylindrical ring.

FIG. 7A is a side view of a stent embodying features of the invention in an unexpanded state.

FIG. 7B is a perspective view of the stent of FIG. 7A depicting the cylindrical wall defined by each cylindrical ring.

FIG. 8 is a perspective view of the stent of FIG. 7A in an expanded condition.

FIG. 9 is a perspective view of the stent of FIG. 8 depicting projecting edges that project radially outwardly from the cylindrical wall.

FIG. 10 is a cross-sectional view of any strut of the stent.

FIG. 11 is a cross-sectional view of any strut of the stent.

FIG. 12 is a side view of the stent depicting cylindrical rings at the end of the stent having a thicker cross-section than the rings at the center of the stent.

FIG. 13 is a plan view of a flattened stent of the invention illustrating a combination of undulating links and straight links.

FIG. 14 is a plan view of a flattened stent of the invention illustrating the pattern of the stent with undulating cylindrical rings and undulating links.

FIG. 15 is an enlarged view of a portion of the stent shown in FIG. 14 depicting an undulating link connecting portions of adjacent cylindrical rings having an undulating configuration.

FIG. 16 is an enlarged sectional view of FIG. 14 depicting a U-shaped portion of the cylindrical ring having an undulating configuration.

FIG. 17A is a side view of a stent embodying features of the invention in an unexpanded state.

FIG. 17B is a perspective view of the stent of FIG. 17A depicting the cylindrical wall defined by each cylindrical ring.

FIG. 18 is a perspective view of the stent of FIG. 17A in an expanded condition.

FIG. 19 is a side view of the stent depicting undulating cylindrical rings at the end of the stent having a thicker cross-section than the rings at the center of the stent.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention stent improves on existing stents by providing a longitudinally flexible stent having a uniquely designed pattern and novel interconnecting members. In addition to providing longitudinal flexibility, the stent of the present invention also provides radial rigidity and a high degree of scaffolding of a vessel wall, such as a coronary artery. The design of the highly flexible interconnecting members and their placement within a W-shaped member provides for uniform scaffolding and a high degree of vessel wall coverage.

Referring now to the drawings, in which like reference numerals are used to designate like or corresponding elements among the several figures, in FIG. 1 there is shown a stent 10 configured in accordance with aspects of the present invention. The stent 10 is mounted on a catheter assembly 12 which is used to deliver the stent and implant it in a body lumen, such as a coronary artery, peripheral artery, or other vessel or lumen within the body. The catheter assembly includes a catheter shaft 13 which has a proximal end 14 and a distal end 16. The catheter assembly is configured to advance through the patient's vascular system by advancing over a guide wire by any of the well known methods of an over the wire system (not shown) or a well known rapid exchange catheter system, such as the one shown in FIG. 1.

The catheter assembly 12 as shown in FIG. 1 is of the well known rapid exchange type which includes an RX port 20 where the guide wire 18 will exit the catheter. The distal end of the guide wire 18 exits the catheter distal end 16 so that the catheter advances along the guide wire on a section of the catheter between the RX port 20 and the catheter distal end 16. As is known in the art, the guide wire lumen which receives the guide wire is sized for receiving various diameter guide wires to suit a particular application. The stent is mounted on the expandable member 22 (balloon) and is crimped tightly thereon so that the stent and expandable member present a low profile diameter for delivery through the arteries.

Referring to FIG. 1, a partial cross-section of an artery 24 is shown with a small amount of plaque that has been previously treated by an angioplasty or other repair procedure. Stent 10 of the present invention is used to repair a diseased or damaged arterial wall which may include the plaque 26 as shown in FIG. 1, or a dissection, or a flap which are commonly found in the coronary arteries, peripheral arteries and other vessels.

In a typical procedure to implant stent 10, the guide wire 18 is advanced through the patient's vascular system by well known methods so that the distal end of the guide wire is advanced past the plaque or diseased area 26. Prior to implanting the stent, the cardiologist may wish to perform an angioplasty procedure or other procedure (i.e., atherectomy) in order to open the vessel and remodel the diseased area. Thereafter, the stent delivery catheter assembly 12 is advanced over the guide wire so that the stent is positioned in the target area. The expandable member or balloon 22 is inflated by well known means so that it expands radially outwardly and in turn expands the stent radially outwardly until the stent is apposed to the vessel wall. The expandable member is then deflated and the catheter withdrawn from the patient's vascular system. The guide wire typically is left in the lumen for post-dilatation procedures, if any, and subsequently is withdrawn from the patient's vascular system. As depicted in FIGS. 2 and 3, the balloon is fully inflated with the stent expanded and pressed against the vessel wall. In FIG. 3, the implanted stent remains in the vessel after the balloon has been deflated and the catheter assembly and guide wire have been withdrawn from the patient.

The stent 10 serves to hold open the artery after the catheter is withdrawn, as illustrated by FIG. 3. Due to the formation of the stent from an elongated tubular member, the undulating components of the stent are relatively flat in transverse cross-section, so that when the stent is expanded, it is pressed into the wall of the artery and as a result does not interfere with the blood flow through the artery. The stent is pressed into the wall of the artery and will eventually be covered with endothelial cell growth which further minimizes blood flow interference. The undulating portion of the stent provides good tacking characteristics to prevent stent movement within the artery. Furthermore, the closely spaced cylindrical elements at regular intervals provide uniform support for the wall of the artery, and consequently are well adapted to tack up and hold in place small flaps or dissections in the wall of the artery, as illustrated in FIGS. 2 and 3.

In keeping with the present invention, FIGS. 4-9 depict stent 10 in various configurations. Turning to FIG. 4, stent 10 is shown in a flattened condition so that the pattern can be clearly viewed, even though the stent is never in this form when in use. The stent is typically formed from a tubular member, however, it can be formed from a flat sheet such as shown in FIG. 4 and rolled into a cylindrical configuration.

As shown in FIGS. 4-6, stent 10 is made up of a plurality of cylindrical rings 40 which extend circumferentially around the stent when it is in a tubular form (see FIGS. 7A and 7B). The stent has a delivery diameter 42 as shown in FIG. 7A, and an implanted diameter 44 as shown in FIG. 8. Each cylindrical ring 40 has a cylindrical ring proximal end 46 and a cylindrical ring distal end 48. Typically, since the stent is laser cut from a solid tube there are no discreet parts such as the described cylindrical rings. However, it is beneficial for identification and reference to various parts to refer to the cylindrical rings and the following parts of the stent.

Each cylindrical ring 40 defines a cylindrical plane 50 (FIG. 7B) which is a plane defined by the proximal and distal ends 46, 48 and the circumferential extent as the cylindrical ring travels around the cylinder. As shown in FIG. 7B, each cylindrical ring includes a cylindrical outer wall surface 52 which defines the outermost surface of the stent, and a cylindrical inner wall surface 53 which defines the innermost surface of the stent. Cylindrical plane 50 follows the cylindrical outer wall surface 52.

In keeping with the invention, undulating link 54 is positioned within cylindrical plane 50. The undulating links connect one cylindrical ring to an adjacent cylindrical ring and enhance the overall longitudinal flexibility of the stent due to their unique construction. The flexibility of the undulating links derives in part from its V-shaped configuration 54 which includes a concave portion 56 and a convex portion 58 wherein the V-shaped link is substantially parallel to the longitudinal axis of the stent. Thus, as the stent 10 is being delivered through a tortuous vessel, such as a coronary artery, the V-shaped configuration 54 of the undulating link will permit the stent to flex in the longitudinal direction which substantially enhances delivery of the stent to the target site. The degree of curvature of the V-shaped link 54 can be increased or decreased from that shown, to achieve a variety of flexibility configurations. Although a straight link that is parallel to the stent axis typically is not flexible and does not add to the flexibility of the stent 10, the unique design of the V-shaped link 54 of the present invention, which includes a plurality of flexible links that project radially inward and outward, enables the stent to possess the requisite flexibility as the stent is flexed in the body.

Cylindrical rings 40 can be positioned such that adjacent rings slightly overlap in the longitudinal direction so that one ring is slightly nested within the next ring and so on. The degree of nesting is dictated primarily by the length of each cylindrical ring, the number of undulations in the rings, the thickness of the struts that make up the rings, and the radius of curvature, all in conjunction with the crimped or delivery diameter of the stent. If the rings are substantially nested one within the other, it may be difficult to crimp the stent to an appropriate delivery diameter without the various struts overlapping. It is also contemplated that the rings are slightly nested even after the stent is expanded, which enhances vessel wall coverage. In some circumstances, it may not be desirable to encompass one ring within the other, which is also contemplated by the invention.

Referring to FIGS. 4-8, the stent 10 can be described more particularly as having a plurality of peaks 70 and valleys 72. Although the stent is not divided into separate elements, for ease of discussion references to peaks and valleys is appropriate. The number of peaks and valleys, sometimes referred to as crowns, can vary in number for each ring depending upon the application. Thus, for example, if the stent is to be implanted in a coronary artery, a lesser number of peaks and valleys (or crowns) are required than if the stent is implanted in a peripheral artery, which has a larger diameter than a coronary artery. As can be seen in FIG. 4, peaks 70 are in phase 74, meaning that the peaks 70 are substantially aligned along the longitudinal axis of the stent. It may be desirable under certain circumstances to position peaks 70 so that they are out of phase (not shown), that is, the peaks of one ring would be circumferentially offset from the peaks of an adjacent ring. As shown in FIG. 4, the peaks are circumferentially offset 77 from the valleys and from the undulating link 54. Positioning the peaks, valleys, and undulating links in this manner, provides a stent having uniform expansion capabilities, high radial strength, a high degree of flexibility, and sufficient wall coverage to support the vessel.

Referring to FIGS. 5A-B and 6, the stent of the invention can be described as having cylindrical rings formed of U-shaped portions 90 and W-shaped portions 94. Again, while the stent is generally laser cut from a solid tube and it typically has no discreet parts, for ease of identification the stent of the invention can be referred to as having U-shaped and W-shaped portions. The U-shaped portions, at their base, or apex, have arm 68 extending therefrom and attached to undulating link 54. The W-shaped portion 94 has at its base or curve portion arm 69 which attaches at the other end of the undulating link. The length of the arms attaching the links to the rings can vary. Importantly, the arms should be sized in conjunction with the undulating link so that the link is properly positioned within the W-shaped portion. Preferably, undulating link 54 is contained within W-shaped portion 94, which should be wide enough to accommodate the undulating link when the stent is crimped so that no portion of the undulating link and the W-portion overlap. It is preferable that the undulating link and the W-shaped portion are substantially in the same cylindrical plane 50 as defined by the cylindrical outer wall surface 52 and the cylindrical inner wall surface 53, as shown in FIG. 7B.

As shown in FIG. 9, under certain stent configurations portions of the stent may project radially outwardly when the stent is expanded from its delivery diameter where it is crimped on the balloon to its expanded diameter when it is implanted in the vessel or artery. For example, as shown in FIGS. 4, 9, 10 and 11, when a strut 98 (any section of the stent)is thinner than it is wide, projecting edges 96 likely will form when the stent is expanded from its delivery diameter to its implanted diameter.

In one aspect of the invention, the stent is formed so that the struts 98 (FIG. 12) have variable thickness along the stent length. As one example, it is contemplated that struts 104 at the ends of the stent may be thicker (or wider) than the struts 106 in the center of the stent for purposes for radiopacity and to counter balloon expansion. When the balloon first inflates, the balloon ends have a tendency to inflate at a faster rate than the balloon center, however, with thicker (or wider) struts at the stent ends the balloon, and hence the stent, will expand more uniformly.

As described above, it is also contemplated that more or fewer undulating links 54 will be positioned between adjacent cylindrical rings 40. It is also contemplated, in order to increase stent stability, that straight links 110, as shown in FIG. 13, in addition to undulating links 54, connect adjacent cylindrical rings. The straight links will provide stability and assist in preventing stent foreshortening, as do the undulating links. Further, the straight links may provide more rigidity in a localized area, such as at the stent ends, such that it may be desirable to incorporate more straight links between the cylindrical rings at the stent ends, than in the center of the stent.

In one important aspect of the invention, after stent 10 is implanted in a coronary artery, or other vessel, because of its novel design, the cylindrical rings 40 have the ability to flex radially as the vessel pulsates when blood pumps through it. Likewise, because of the novel and unique design of undulating links 54, as the vessel moves and pulsates from the pumping blood, the stent can flex longitudinally. The radial and longitudinal flexing of the stent reduces the likelihood that the stent will cause injury to the intima of a coronary artery, which also may have a tendency to reduce the likelihood of restenosis.

Referring to FIG. 14, stent 10 is shown in a flattened condition so that the pattern can be clearly viewed, even though the stent is never in this form in use. As mentioned earlier, the stent is typically formed from a tubular member, however, it can be formed from a flat sheet such as shown in FIGS. 4 and 14 and rolled into a cylindrical configuration.

As shown in FIGS. 14-16, stent 10 is made up of a plurality of cylindrical rings 108 which extend circumferentially around the stent when it is in a tubular form (see FIGS. 17A and 17B). The plurality of cylindrical rings have an undulating shape in the form of a V-shaped configuration 108. The flexibility of the undulating cylindrical rings derives in part from their V-shaped configuration 108 which includes a concave portion 112 and a convex portion 114, as illustrated in FIG. 15. As the stent 10 is being delivered through a tortuous vessel, such as a coronary artery, the V-shaped configuration 108 of the undulating cylindrical rings will permit the stent to flex in the longitudinal direction which substantially enhances delivery of the stent to the target site. Further, the degree of curvature of the V-shaped cylindrical rings 108 can be increased or decreased from that shown, to achieve a variety of flexibility configurations.

The stent 10 has a delivery diameter 116 as shown in FIG. 17A, and an implanted diameter 118 as shown in FIG. 18. Each undulating cylindrical ring 108 has a cylindrical ring proximal end 120 and a cylindrical ring distal end 122. As mentioned above, since the stent is laser cut from a solid tube there are no discreet parts such as the described cylindrical rings. However, it is beneficial for identification and reference to various parts to refer to the cylindrical rings and the following parts of the stent.

Each undulating cylindrical ring 108 defines a cylindrical plane 123 (FIG. 17B) which is a plane defined by the proximal ends 120 and distal ends 122 and the circumferential extent as the cylindrical ring travels around the cylinder. As shown in FIG. 17B, each undulating cylindrical ring 108 includes a cylindrical outer wall surface 124, which defines the outermost surface of the stent, and a cylindrical inner wall surface 126 which defines the innermost surface of the stent. Cylindrical plane 123 follows the cylindrical outer wall surface 124.

With further reference to FIG. 17B, undulating link 54 is positioned within cylindrical plane 123. An undulating cylindrical ring 108 is connected to an adjacent undulating cylindrical ring by the undulating links 54 which enhance the overall longitudinal flexibility of the stent due to their unique construction. As previously mentioned, the flexibility of the undulating links derives in part from their V-shaped configuration 54 which includes a concave portion 56 and a convex portion 58 wherein the V-shaped link is substantially parallel to the longitudinal axis of the stent. The above description of the unique design of the undulating links for the embodiment having only undulating links applies to this embodiment as well which includes both undulating cylindrical rings and links.

The undulating cylindrical rings 108 can be positioned such that adjacent rings slightly overlap in the longitudinal direction so that one ring is slightly nested within the next ring and so on. As described above, the degree of nesting is dictated primarily by the length of each cylindrical ring, the number of undulations in the rings, the thickness of the struts that make up the rings, and the radius of curvature, all in conjunction with the crimped or delivery diameter of the stent. Again, if the undulating cylindrical rings are substantially nested one within the other, it may be difficult to crimp the stent to an appropriate delivery diameter without the various struts overlapping. It is also contemplated that the undulating cylindrical rings are slightly nested even after the stent is expanded, which enhances vessel wall coverage. In some circumstances, it may not be desirable to encompass one ring within the other, which is also contemplated by the invention.

Referring to FIGS. 14-19, the stent 10 can be described more particularly as having a plurality of peaks 128 and valleys 130. As shown in FIG. 14, peaks 128 are in phase 132, meaning that the peaks are substantially aligned along the longitudinal axis of the stent. Under certain circumstances, it may be desirable to position peaks 128 so that they are out of phase (not shown), that is, the peaks of one ring would be circumferentially offset from the peaks of an adjacent ring. As further shown in FIG. 14, the peaks 128 are circumferentially offset 77 from the valleys 130 and from the undulating link 54. With the positioning of the peaks, valleys, and undulating links in this manner, the stent is provided having uniform expansion capabilities, high radial strength, a high degree of flexibility, and sufficient wall coverage to support the vessel.

Referring to FIGS. 15 and 16, the stent 10 includes a plurality of undulating cylindrical rings 108 formed of U-shaped portions 134 and W-shaped portions 136. The U-shaped portions 134 have an arm 138 at their base or apex extending therefrom and attached to undulating link 54. The W-shaped portion 136 has an arm 140 at its base or curve portion which attaches at the other end of the undulating link 54. The length of the arms attaching the links to the rings can vary. It is important that the arms be sized in conjunction with the undulating link so that the link is properly positioned within the W-shaped portion. It is preferable that the undulating link 54 is positioned within the W-shaped portion 136, which should be wide enough to accommodate the undulating link when the stent is crimped so as to prevent the overlap of the undulating link and the W-portion.

Referring to FIG. 19, the stent 10 is formed so that struts 142 of the undulating cylindrical rings have variable thickness along the stent length. For example, it is contemplated that struts 144 at the ends of the stent 10 may be thicker than the struts 146 in the center of the stent for purposes of radiopacity and to counter balloon expansion. Accordingly, as the balloon first inflates, the balloon ends tend to inflate at a faster rate than the balloon center, however, with thicker struts at the stent ends, the balloon, and hence the stent, will expand more uniformly. Further, one strut 142 may have a cross-section different from the other struts of the stent 10.

The stent 10 of the present invention can be made in many ways. One method of making the stent is to cut a thin-walled tubular member, such as stainless steel tubing to remove portions of the tubing in the desired pattern for the stent, leaving relatively untouched the portions of the metallic tubing which are to form the stent. In accordance with the invention, it is preferred to cut the tubing in the desired pattern by means of a machine-controlled laser as is well known in the art. Stents also can be made from numerous other alloys such as cobalt-chromium, cobalt-chromium-tungsten, nickel-titanium, titanium, tantalum, and shape memory and superelastic alloys.

The tubing may be made of suitable biocompatible material such as stainless steel. The stainless steel tube may be Alloy type: 316L SS, Special Chemistry per ASTM F138-92 or ASTM F139-92 grade 2. Special Chemistry of type 316L per ASTM F138-92 or ASTM F139-92 Stainless Steel for Surgical Implants in weight percent.

Carbon (C) 0.03% max. Manganese (Mn) 2.00% max. Phosphorous (P) 0.025% max.  Sulphur (S) 0.010% max.  Silicon (Si) 0.75% max. Chromium (Cr) 17.00-19.00% Nickel (Ni) 13.00-15.50% Molybdenum (Mo) 2.00-3.00% Nitrogen (N) 0.10% max. Copper (Cu) 0.50% max. Iron (Fe) Balance

The stent diameter is very small, so the tubing from which it is made must necessarily also have a small diameter. Typically the stent has an outer diameter on the order of about 0.06 inch in the unexpanded condition, the same outer diameter of the tubing from which it is made, and can be expanded to an outer diameter of 0.1 inch or more. The wall thickness of the tubing is about 0.003 inch.

The tubing is mounted in a rotatable collet fixture of a machine-controlled apparatus for positioning the tubing relative to a laser. According to machine-encoded instructions, the tubing is rotated and moved longitudinally relative to the laser which is also machine controlled. The laser selectively removes the material from the tubing by ablation and a pattern is cut into the tube. The tube is therefore cut into the discrete pattern of the finished stent.

The process of cutting a pattern for the stent into the tubing is automated except for loading and unloading the length of tubing. In one example, a CNC-opposing collet fixture for axial rotation of the length of tubing is used in conjunction with a CNC X/Y table to move the length of tubing axially relatively to a machine-controlled laser. The entire space between collets can be patterned using the CO₂ laser set-up of the foregoing example. The program for control of the apparatus is dependent on the particular configuration used and the pattern to be ablated in the coating.

Cutting a fine structure (0.0035 inch web width) requires minimal heat input and the ability to manipulate the tube with precision. It is also necessary to support the tube yet not allow the stent structure to distort during the cutting operation. In order to successfully achieve the desired end results, the entire system must be configured very carefully. The tubes are made typically of stainless steel with an outside diameter of 0.060 inch to 0.066 inch and a wall thickness of 0.002 inch to 0.010 inch. These tubes are fixtured under a laser and positioned utilizing a CNC to generate a very intricate and precise pattern. Due to the thin wall and the small geometry of the stent pattern (0.0035 inch typical web width), it is necessary to have very precise control of the laser, its power level, the focused spot size, and the precise positioning of the laser cutting path.

In order to minimize the heat input into the stent structure, which prevents thermal distortion, uncontrolled burn out of the metal, and metallurgical damage due to excessive heat, and thereby produce a smooth debris free cut, a Q-switched Nd-YAG, typically available from Quantronix of Hauppauge, N.Y., that is frequency doubled to produce a green beam at 532 nanometers is utilized. Q-switching produces very short pulses (<100 nS) of high peak powers (kilowatts), low energy per pulse (≦3 mJ), at high pulse rates (up to 40 kHz). The frequency doubling of the beam from 1.06 microns to 0.532 microns allows the beam to be focused to a spot size that is 2 times smaller, therefore increasing the power density by a factor of 4 times. With all of these parameters, it is possible to make smooth, narrow cuts in the stainless tubes in very fine geometries without damaging the narrow struts that make up to stent structure. Hence, the system of the present invention makes it possible to adjust the laser parameters to cut narrow kerf width which will minimize the heat input into the material.

The positioning of the tubular structure requires the use of precision CNC equipment such as that manufactured and sold by Anorad Corporation. In addition, a unique rotary mechanism has been provided that allows the computer program to be written as if the pattern were being cut from a flat sheet. This allows both circular and linear interpolation to be utilized in programming. Since the finished structure of the stent is very small, a precision drive mechanism is required that supports and drives both ends of the tubular structure as it is cut. Since both ends are driven, they must be aligned and precisely synchronized, otherwise the stent structure would twist and distort as it is being cut.

The optical system which expands the original laser beam, delivers the beam through a viewing head and focuses the beam onto the surface of the tube, incorporates a coaxial gas jet and nozzle that helps to remove debris from the kerf and cools the region where the beam interacts with the material as the beam cuts and vaporizes the metal. It is also necessary to block the beam as it cuts through the top surface of the tube and prevent the beam, along with the molten metal and debris from the cut, from impinging on the opposite surface of the tube.

In addition to the laser and the CNC positioning equipment, the optical delivery system includes a beam expander to increase the laser beam diameter, a circular polarizer, typically in the form of a quarter wave plate, to eliminate polarization effects in metal cutting, provisions for a spatial filter, a binocular viewing head and focusing lens, and a coaxial gas jet that provides for the introduction of a gas stream that surrounds the focused beam and is directed along the beam axis. The coaxial gas jet nozzle (0.018 inch I.D.) is centered around the focused beam with approximately 0.010 inch between the tip of the nozzle and the tubing. The jet is pressurized with oxygen at 20 psi and is directed at the tube with the focused laser beam exiting the tip of the nozzle (0.018 inch diameter). The oxygen reacts with the metal to assist in the cutting process very similar to oxyacetylene cutting. The focused laser beam acts as an ignition source and controls the reaction of the oxygen with the metal. In this manner, it is possible to cut the material with a very fine kerf with precision. In order to prevent burning by the beam and/or molten slag on the far wall of the tube I.D., a stainless steel mandrel (approx. 0.034 inch diameter) is placed inside the tube and is allowed to roll on the bottom of the tube as the pattern is cut. This acts as a beam/debris block protecting the far wall I.D.

Alternatively, this maybe accomplished by inserting a second tube inside the stent tube which has an opening to trap the excess energy in the beam which is transmitted through the kerf along which collecting the debris that is ejected from the laser cut kerf. A vacuum or positive pressure can be placed in this shielding tube to remove the collection of debris.

Another technique that could be utilized to remove the debris from the kerf and cool the surrounding material would be to use the inner beam blocking tube as an internal gas jet. By sealing one end of the tube and making a small hole in the side and placing it directly under the focused laser beam, gas pressure could be applied creating a small jet that would force the debris out of the laser cut kerf from the inside out. This would eliminate any debris from forming or collecting on the inside of the stent structure. It would place all the debris on the outside. With the use of special protective coatings, the resultant debris can be easily removed.

In most cases, the gas utilized in the jets may be reactive or non-reactive (inert). In the case of reactive gas, oxygen or compressed air is used. Compressed air is used in this application since it offers more control of the material removed and reduces the thermal effects of the material itself. Inert gas such as argon, helium, or nitrogen can be used to eliminate any oxidation of the cut material. The result is a cut edge with no oxidation, but there is usually a tail of molten material that collects along the exit side of the gas jet that must be mechanically or chemically removed after the cutting operation.

The cutting process utilizing oxygen with the finely focused green beam results in a very narrow kerf (approx. 0.0005 inch) with the molten slag re-solidifying along the cut. This traps the cut out scrap of the pattern requiring further processing. In order to remove the slag debris from the cut allowing the scrap to be removed from the remaining stent pattern, it is necessary to soak the cut tube in a solution of HCL for approximately eight minutes at a temperature of approximately 55° C. Before it is soaked, the tube is placed in a bath of alcohol/water solution and ultrasonically cleaned for approximately 1 minute to remove the loose debris left from the cutting operation. After soaking, the tube is then ultrasonically cleaned in the heated HCL for 1-4 minutes depending upon the wall thickness. To prevent cracking/breaking of the struts attached to the material left at the two ends of the stent pattern due to harmonic oscillations induced by the ultrasonic cleaner, a mandrel is placed down the center of the tube during the cleaning/scrap removal process. At completion of this process, the stent structure are rinsed in water. They are now ready for electropolishing.

The stents are preferably electrochemically polished in an acidic aqueous solution which is generally known in the art. The stents may be further treated if desired, for example by applying a biocompatible coating.

It will be apparent that both focused laser spot size and depth of focus can be controlled by selecting beam diameter and focal length for the focusing lens. It will be apparent that increasing laser beam diameter, or reducing lens focal length, reduces spot size at the cost of depth of field.

Direct laser cutting produces edges which are essentially perpendicular to the axis of the laser cutting beam, in contrast with chemical etching and the like which produce pattern edges which are angled. Hence, the laser cutting process essentially provides strut cross-sections, from cut-to-cut, which are square or rectangular, rather than trapezoidal. As depicted, cylindrical rings 40 are comprised of struts 98 which have generally rectangular cross-sections 100 when the stent is laser cut from a tubular member. Further, undulating cylindrical rings 108 are also comprised of struts 142 which have generally rectangular cross-sections 100 when the stent is laser cut from a tubular member. The struts have generally perpendicular edges formed by the laser cut. The resulting stent structure provides superior performance.

Other methods of forming the stent of the present invention can be used, such as chemical etching; electric discharge machining; laser cutting a flat sheet and rolling it into a cylinder; and the like, all of which are well known in the art at this time.

The stent of the present invention also can be made from metal alloys other than stainless steel, such as shape memory alloys. Shape memory alloys are well known and include, but are not limited to, nickel titanium and nickel/titanium/vanadium. Any of the shape memory alloys can be formed into a tube and laser cut in order to form the pattern of the stent of the present invention. As is well known, the shape memory alloys of the stent of the present invention can include the type known as thermoelastic martensitic transformation, or display stress-induced martensite. These types of alloys are well known in the art and need not be further described here.

Importantly, a stent formed of shape memory alloys, whether the thermoelastic or the stress-induced martensite-type, can be delivered using a balloon catheter of the type described herein, or in the case of stress induced martensite, be delivered via a catheter without a balloon or a sheath catheter.

While the invention has been illustrated and described herein, in terms of its use as an intravascular stent, it will be apparent to those skilled in the art that the stent can be used in other body lumens. Further, particular sizes and dimensions, number of crowns per ring, materials used, and the like have been described herein and are provided as examples only. Other modifications and improvements may be made without departing from the scope of the invention. 

What is claimed:
 1. A flexible intravascular stent for implanting in a body lumen, comprising: a plurality of cylindrical rings interconnected to form the stent, each cylindrical ring having a delivery diameter and an expanded diameter; each cylindrical ring having a proximal end and a distal end and a cylindrical outer wall surface and a cylindrical inner wall surface extending circumferentially between the proximal end and the distal end of the cylindrical ring; at least one undulating link attaching each cylindrical ring to an adjacent cylindrical ring, the attachment of the at least one undulating link to each cylindrical ring forming a W-shaped portion; wherein the at least one undulating link includes at least one of a radially inward bend and a radially outward bend with a concave portion and a convex portion such that the convex portion of the at least one undulating link is substantially within the cylindrical inner wall surface when the stent is in the delivery diameter and the expanded diameter.
 2. The stent of claim 1, wherein the at least one undulating link comprises a V-shape portion, the V-shape portion having a length and being substantially parallel to a longitudinal axis of the stent.
 3. The stent of claim 2, wherein the V-shape portion of the at least one undulating link is parallel to the stent longitudinal axis when the stent is in the delivery diameter configuration.
 4. The stent of claim 2, wherein the V-shape portion of the at least one undulating link is parallel to the stent longitudinal axis when the stent is in the expanded diameter configuration.
 5. The stent of claim 1, wherein the proximal end of each cylindrical ring is slightly nested within an adjacent cylindrical ring.
 6. The stent of claim 5, wherein the proximal end of each cylindrical ring is slightly nested within an adjacent cylindrical ring when the stent is in the delivery diameter configuration.
 7. The stent of claim 1, wherein each cylindrical ring comprises a plurality of peaks and valleys.
 8. The stent of claim 7, wherein each peak configuring a W-shaped portion from each of two alternating cylindrical rings is positioned slightly between each valley.
 9. The stent of claim 7, wherein at least one peak configuring a W-shaped portion of alternating cylindrical rings is positioned slightly between at least one valley.
 10. The stent of claim 1, wherein the at least one undulating link is configured to provide flexibility to the stent.
 11. The stent of claim 1, wherein the cylindrical rings are configured to provide flexibility to the stent.
 12. The stent of claim 1, wherein the stent is formed from an elongated tubular member.
 13. The stent of claim 1, wherein the stent is formed from a biocompatible metal alloy.
 14. The stent of claim 1, wherein the stent is formed from a metal alloy taken from the group of metal alloys including stainless steel, cobalt chromium, cobalt/chromium/tungsten, titanium and tantalum.
 15. The stent of claim 1, wherein the stent is formed from a shape memory alloy.
 16. The stent of claim 15, wherein the shape memory alloy includes nickel titanium or nickel/titanium/vanadium.
 17. The stent of claim 1, wherein the stent is formed from a pseudoelastic metal alloy.
 18. The stent of claim 17, wherein the pseudoelastic metal alloy includes nickel titanium or nickel/titanium/vanadium.
 19. The stent of claim 1, wherein the cylindrical rings and the undulating links are defined by a plurality of struts.
 20. The stent of claim 19, wherein at least one of the struts includes a cross-section different from the other struts.
 21. The stent of claim 19, wherein at least one of the struts includes a variable thickness.
 22. The stent of claim 1, wherein the at least one radially inward bend and the at least one radially outward bend converge at the convex portion of the undulating link.
 23. The stent of claim 1, wherein the at least one radially inward bend and the at least one radially outward bend define an inner space.
 24. The stent of claim 23, the inner space includes the concave portion of the undulating link.
 25. A flexible intravascular stent for implanting in a body lumen, comprising: a plurality of cylindrical rings interconnected to form the stent, each cylindrical ring having a delivery diameter and an expanded diameter; each cylindrical ring having a plurality of peaks and valleys, the valleys of one cylindrical ring being circumferentially offset from the valleys of an adjacent cylindrical ring; at least one undulating link attaching each cylindrical ring to an adjacent cylindrical ring, the at least one undulating link being positioned substantially within one of the valleys and attaching the valley to an adjacent peak; wherein the at least one undulating link includes at least one of a radially inward bend and a radially outward bend with a concave portion and a convex portion such that the convex portion of the at least one undulating link is substantially within a cylindrical inner wall surface when the stent is in the delivery diameter and the expanded diameter.
 26. The stent of claim 25, wherein the at least one undulating link comprises a V-shape portion, the V-shape portion having a length and being substantially parallel to a longitudinal axis of the stent.
 27. The stent of claim 26, wherein the V-shape portion of the at least one undulating link is parallel to the stent longitudinal axis when the stent is in the delivery diameter configuration.
 28. The stent of claim 26, wherein the V-shape portion of the at least one undulating link is parallel to the stent longitudinal axis when the stent is in the expanded diameter configuration.
 29. The stent of claim 25, wherein the proximal end of each cylindrical ring is slightly nested within an adjacent cylindrical ring.
 30. The stent of claim 29, wherein the proximal end of each cylindrical ring is slightly nested within an adjacent cylindrical ring when the stent is in the delivery diameter configuration.
 31. The stent of claim 25, wherein at least one peak configuring a W-shaped portion from each of two alternating cylindrical rings is positioned slightly between at least one valley.
 32. The stent of claim 25, wherein the at least one undulating link is configured to provide flexibility to the stent.
 33. The stent of claim 25, wherein the cylindrical rings are configured to provide flexibility to the stent.
 34. The stent of claim 25, wherein the stent is formed from an elongated tubular member.
 35. The stent of claim 25, wherein the stent is formed from a biocompatible metal alloy.
 36. The stent of claim 25, wherein the stent is formed from a metal alloy taken from the group of metal alloys including stainless steel, cobalt chromium, cobalt/chromium/tungsten, titanium and tantalum.
 37. The stent of claim 25, wherein the stent is formed from a shape memory alloy.
 38. The stent of claim 37, wherein the shape memory alloy includes nickel titanium or nickel/titanium/vanadium.
 39. The stent of claim 25, wherein the stent is formed from a pseudoelastic metal alloy.
 40. The tent of claim 39, wherein the pseudoelastic metal alloy includes nickel titanium or nickel/titanium/vanadium.
 41. The stent of claim 25, wherein the cylindrical rings and the undulating links are defined by a plurality of struts.
 42. The stent of claim 41, wherein at least one of the struts includes a cross-section different from the other struts.
 43. The stent of claim 41, wherein at least one of the struts includes a variable thickness.
 44. A flexible intravascular stent for implanting in a body lumen, comprising: a plurality of cylindrical rings interconnected to form the stent, each cylindrical ring having a delivery diameter and an expanded diameter; the cylindrical rings having an undulating shape, wherein the cylindrical rings include a plurality of U-shaped portions and W-shaped portions that are expandable; each cylindrical ring having a proximal end and a distal end and a cylindrical outer wall surface and a cylindrical inner wall surface extending circumferentially between the proximal end and the distal end of the cylindrical ring; at least one undulating link attaching each cylindrical ring to an adjacent cylindrical ring, the attachment of the at least one undulating link to each cylindrical ring forming a W-shaped portion; wherein the at least one undulating link includes at least one radially inward bend and radially outward bend with a concave portion and a convex portion such that the convex portion of the at least one undulating link is substantially within the cylindrical inner wall surface when the stent is in the delivery diameter and the expanded diameter.
 45. The stent of claim 44, wherein the at least one undulating link comprises a V-shape portion, the V-shape portion having a length and being substantially parallel to a longitudinal axis of the stent.
 46. The stent of claim 45, wherein the V-shape portion of the at least one undulating link is parallel to the stent longitudinal axis when the stent is in the delivery diameter configuration.
 47. The stent of claim 45, wherein the V-shape portion of the at least one undulating link is parallel to the stent longitudinal axis when the stent is in the expanded diameter configuration.
 48. The stent of claim 44, wherein the proximal end of each cylindrical ring having an undulating shape is slightly nested within an adjacent cylindrical ring having an undulating shape.
 49. The stent of claim 44, wherein the undulating links are configured to provide flexibility to the stent.
 50. The stent of claim 44, wherein the cylindrical rings having an undulating shape are configured to provide flexibility to the stent.
 51. The stent of claim 44, wherein the stent is formed from an elongated tubular member.
 52. The stent of claim 44, wherein the stent is formed from a biocompatible metal alloy.
 53. The stent of claim 44, wherein the stent is formed from a metal alloy taken from the group of metal alloys including stainless steel, cobalt chromium, cobalt/chromium/tungsten, titanium and tantalum.
 54. The stent of claim 44, wherein the stent is formed from a shape memory alloy.
 55. The stent of claim 54, wherein the shape memory alloy includes nickel titanium or nickel/titanium/vanadium.
 56. The stent of claim 44, wherein the stent is formed from a pseudoelastic metal alloy.
 57. The stent of claim 56, wherein the pseudoelastic metal alloy includes nickel titanium or nickel/titanium/vanadium.
 58. The stent of claim 44, wherein the cylindrical rings having an undulating shape and the undulating links are defined by a plurality of struts.
 59. The stent of claim 58, wherein the plurality of struts of the cylindrical rings assume a V-shaped configuration.
 60. The stent of claim 58, wherein at least one of the struts has a cross-section different from the other struts.
 61. The stent of claim 58, wherein at least one of the struts includes a variable thickness.
 62. The stent of claim 44, wherein the W-shaped portions are formed from the combination of the U-shaped portions with the undulating links.
 63. The stent of claim 44, wherein the W-shaped portions incorporate at least a portion of the undulating links.
 64. A flexible intravascular stent for implanting in a body lumen, comprising: a plurality of cylindrical rings interconnected to form the stent, each cylindrical ring having a delivery diameter and an expanded diameter; each cylindrical ring having a proximal end and a distal end and a cylindrical outer wall surface and a cylindrical inner wall surface extending circumferentially between the proximal end and the distal end of the cylindrical ring; means for attaching each cylindrical ring to an adjacent cylindrical ring, the means for attaching being positioned substantially within the cylindrical wall of the cylindrical ring such that a W-shaped portion is formed; wherein the means for attaching each cylindrical ring to an adjacent cylindrical ring includes at least one of a radially inward bend and a radially outward bend with a concave portion and a convex portion such that the convex portion of the attaching means is substantially within the cylindrical inner wall surface when the stent is in the delivery diameter and the expanded diameter.
 65. The stent of claim 64, wherein the means for attaching comprises at least one undulating link between adjacent cylindrical rings.
 66. The stent of claim 65, wherein the at least one undulating link comprises a V-shape portion, the V-shape portion having a length and being substantially parallel to a longitudinal axis of the stent.
 67. The stent of claim 66, wherein the V-shape portion of the at least one undulating link is parallel to the stent longitudinal axis when the stent is in the delivery diameter configuration.
 68. The stent of claim 66, wherein the V-shape portion of the at least one undulating link is parallel to the stent longitudinal axis when the stent is in the expanded diameter configuration. 